研究目的
To investigate self-driven all-inorganic perovskite Schottky photodetectors with high performance and stability.
研究成果
The optimized PDs with CsPbBr3 MP demonstrated an on/off ratio >106, a high responsivity of ~ 0.2 A/W, an excellent weak light sensitivity of 8 nW, a large linear dynamic range of 137 dB, and a fast response time of 75 μs at zero bias. The devices exhibit excellent long-term and thermal stability, with negligible degradation after 3 months storage or 20000 cycles switch, and maintained almost 100% of its initial performance after annealing at high temperature up to 250°C.
研究不足
The study focuses on the performance and stability of all-inorganic perovskite Schottky photodetectors, but the scalability and integration of these devices into practical applications are not addressed.
1：Experimental Design and Method Selection:
The CsPbBr(3-x)Clx MPs were synthesized by a simple and low-cost space-confined growth method at low temperature. A Schottky junction is formed at the interface between perovskite and electrode due to the different work functions of ITO and gold.
2：Sample Selection and Data Sources:
The CsPbBr(3-x)Clx MPs were grown on hydrophilic ITO substrates.
3：List of Experimental Equipment and Materials:
FE-SEM (JSM 6700F, Japan), AFM (Bruker Multimode 8 AFM system), XRD (D8 FOCUS XRD), PL measurement system with a 325 nm laser, PL decay measurement system with a 488 nm laser.
4：Experimental Procedures and Operational Workflow:
The precursor solution was dropped on the ITO substrate, covered by another silicon oxide substrate, and transferred into a sealed beaker with toluene vapor at 50°C for 2 days. The Au electrode was thermal evaporation on the MPs.
5：Data Analysis Methods:
The performance of the PDs was evaluated by current-voltage (I-V) and temporal response curves recorded by a Keysight B2912A Precision Sources/Measure Unit.
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AFM
Bruker Multimode 8
Bruker
Atomic force microscopy imaging
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PL decay measurement system
HORIBA Jobin Yvon IBH Ltd
HORIBA
PL decay measurement
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Precision Sources/Measure Unit
Keysight B2912A
Keysight
Current-voltage and temporal response curves recording
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FE-SEM
JSM 6700F
Japan
Surface morphology observation
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XRD
D8 FOCUS
Crystal structure determination
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PL measurement system
Steady-state photoluminescence spectrum measurement
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Xenon arc lamp
Newport
Newport
Light source for photosensitivity measurement
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Monochromator
Obtaining homogeneous light
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Laser diode
405 nm
Light source for current-time measurement
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Standard Si detector
Determining the power of light
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